DMV CDL TEST questions with correct answers

You should know that brakes are fading when: - Ans - You have to push harder on the brake pedal to control your speed on a down grade. The brake system that applies the use of the brakes when the driver uses the brake is the: - Ans - Service brake system. The air compressor governor controls: - Ans - When air is pumped into the air tanks. If your truck's air compressor has its own oil supply. When should you first check its oil level? - Ans - Before driving. For air brake systems in good conditions the air compressor should start pumping at about: - Ans - 100 psi If your vehicle has an alcohol evaporator, it is there to: - Ans - Reduce the risk of ice in air brake valves in cold weather. Some air brake systems have an alcohol evaporator. What will happen if you don't keep the unit filled with alcohol? - Ans - Ice will form in the storage tanks and cause the brakes to fail. The safety valve is set automatically to reduce pressure at: - Ans - 150 psi